소성∙가공 (Transactions of Materials Processing)

  • 제20권5호
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  • Pages.362-368
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  • 2011
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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레이저 용접된 보론강판의 고온 인장 특성 평가

Flow Behavior of Laser Welded Boron Steel Sheet in Uniaxial Tension at Elevated Temperature

  • 김대용 (한국기계연구원 부설 재료연구소 변형제어연구그룹) ;
  • 김지훈 (한국기계연구원 부설 재료연구소 변형제어연구그룹) ;
  • 유동훈 (서울대학교 재료공학부) ;
  • 정관수 (서울대학교 재료공학부) ;
  • 김용 (고등기술연구원 로봇/생산기술센터) ;
  • 이문용 (성우하이텍 기술연구소)
  • 투고 : 2011.06.13
  • 심사 : 2011.07.22
  • 발행 : 2011.08.01
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초록

For the purpose of improving crashworthiness qualities and maximizing weight saving efficiency, TWB's(tailor welded blanks) of quench-hardenable boron steel sheet formed by hot stamping processes has been used for automotive BIW (body in white) applications. In this work, the flow behaviors of TWB of quench-hardenable boron steel sheet were investigated in uniaxial tension tests at elevated temperature. TWB's having a uniform thickness of 1.4mm were fabricated by laser welding. Specimens with two weld line directions were used to test the mechanical property and reliability of the weld zone. After heating at $950^{\circ}C$ for 5min, the specimens were subjected to tension test at 650, 700 and $800^{\circ}C$ with a strain rate of 0.01 /s and at $700^{\circ}C$ with strain rates of 0.01, 0.1 and 1/s. The ultimate strength of the weld zones was higher than that of the base materials at 650 and $700^{\circ}C$, but was similar to the base metal at $800^{\circ}C$. Fracture occurred at the base material at 650 and $700^{\circ}C$, but at the weld zone at $800^{\circ}C$.

키워드

참고문헌

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피인용 문헌

  1. Formability Evaluation of Tailor Welded Blanks of Boron Steel Sheets by Erichsen Cupping Test at Elevated Temperature vol.20, pp.8, 2011, https://doi.org/10.5228/KSTP.2011.20.8.568
  2. Laser Welding Properties of the S45C using Automobile Brake Parts vol.22, pp.1, 2014, https://doi.org/10.7467/KSAE.2014.22.1.103